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Old 09-19-2009, 08:24 PM   #1
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I want to insulate my attic i have 2 by 6 rafters. I have fiberglass insulation now but i'd like to put an insulation that has a higher r value but i don't want the insulation to be more then 6 inches high so that i can put plywod down so i can use the attic for storage.

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Old 09-19-2009, 08:31 PM   #2
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With 2x6 you can use standard R19 or R21
You also need to make there is ventilation along the roof decking
That takes about an inch or more

So without furring out the 2x6 rafters you will be limited to about R15
You can buy that - expands to about 3.5"

You have 2x6 rafters or floor joists?
You are putting plywood "down"....on the floor?
What are you insulating ?

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Old 09-19-2009, 09:50 PM   #3
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For your attic floor, you can use many different types of insulation, each with it's own rating, ease of use, cost, etc. Here are some types, check your local area for supply: http://hes.lbl.gov/hes/makingithappe...omparison.html

Your area may require a specific R-rating for the climate, check with your State's Energy Department web site.

This would fit the bill for a 32-1/2 R factor in your ceiling (2x6) joist space: http://www.lowes.com/lowes/lkn?actio...065&lpage=none
Be safe, Gary
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Old 09-20-2009, 08:55 AM   #4
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quote=Scuba_Dave;329793]With 2x6 you can use standard R19 or R21
You also need to make there is ventilation along the roof decking
That takes about an inch or more

So without furring out the 2x6 rafters you will be limited to about R15
You can buy that - expands to about 3.5"

You have 2x6 rafters or floor joists?
You are putting plywood "down"....on the floor?
What are you insulating ?[/quote]

It would be 2 x 6 floor joints, i want to insulate the floor of the attic then put plywood down but i'd like to get the best insulation for a good r value but have it fit between the joints with furring out the joists. I hear that they make fiberglass insulation more dense or i've heard about denim insulation?
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Old 09-20-2009, 09:02 AM   #5
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It would be 2 x 6 floor joints, i want to insulate the floor of the attic then put plywood down but i'd like to get the best insulation for a good r value but have it fit between the joints with furring out the joists. I hear that they make fiberglass insulation more dense or i've heard about denim insulation?
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Old 09-20-2009, 10:08 AM   #6
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R21 for fiberglass is the best you can get that I know of
It will fit between 16 or 24" OC joists

GBAR's method will give you 50% more RValue - a little harder to install as you will have to cut multiple pieces in 1/2 or 1/3 to fit

Are you located in a cold area ?
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Old 09-20-2009, 10:31 AM   #7
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live in northern new jersey, what is GBAR's method??? I have 16 on centers
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Old 09-20-2009, 10:32 AM   #8
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Quote:
Originally Posted by GBR in WA View Post
This would fit the bill for a 32-1/2 R factor in your ceiling (2x6) joist space: http://www.lowes.com/lowes/lkn?actio...065&lpage=none
Be safe, Gary
Using foam board - higher RValue

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